To me, for a simple concept I have to say that the power-supply is mind-numbingly complicated.

I am completing (i.e. modifying) what I claim to be a very low-distortion pre-amplifier. I don't think it has a "sound" The output is very clean and crystal clear; I am hoping to make it a little better before I write it up for this forum.

To me, for a simple concept I have to say that the power-supply is mind-numbingly complicated.

Not only needlessly complex, but it also has errors. The stated output voltage is 220 volts. The reference voltage (zener chain) is 204 volts. But the range of control on the feedback pot is from about 42% to 58% of the output., thus it could only regulate the output to a much higher voltage than stated.

My question, though, is why bypass the cathode then throw away the gain with a divider, why not instead leave the cathode unbypassed and then connect the next stage directly to the first stage's plate?

Anyway, I hope formula 22 won't be discouraged by the initial reception this thread has received, and will continue with this project.